Grinding machine



Nov. 19, 1929. c. H. NORTON GRINDING MACHINE Filed June 26. 1926 3 w Om A I Patented Nov. 1 -1 9, 1929 UNITED STATES. PATENT OFFICE CHARLES H. NORTON, OF PLAINVILLE, CONNECTICUT, ASSIGNOR TO NORTON COM- raw, or wo CESTER, MASSACHUSETTS, CORPORATION OF MASSACHUSETTS GRINDING MACHINE chine for automatically polishing or abrading the work, and more particularly to the provision of such means in a steadyrest whereby a piece of work may be steadied against the grinding wheel. thrust and simultaneously polished, or honed while 'it is being ground byvthe grinding wheel.

Heretofore, in precision grinding when it is desired to put a high polish upon the work it has been necessary to grind the work to size in a precision grinding machine and then transfer the work to another machine for the p'urposeof polishingits surface as desired.

Furthermore,- in grinding certain types of work, such as a pin of a crankshaft, it is neces- "sary to hold the work rigidly so as to prevent springing and vibration of the work during grinding. For this purpose it has been common practice to employ a work steadying member 'or steadyrest appropriately positioned against the work so as to resist the thrust of the grindin wheel upon the work.

It is anobject'of t e present invention to provide means whereby the work may be ground accurately to size and be given a high polish in a single operation.

It is a further object of the invention to provide means for polishing or, honing or abrading the work during the grinding operation'whereby the work may be given a high polish as the work is being ground without increasing the time required for the grinding operation and without appreciable additional effort upon the part of the operator beyond his usual duties in grinding.

In accordance with the present invention a non-rotatable abrading member is provided which is so constructed that it may be brought into contactwith the surface of the work at some time during the normal grinding operation to exert the desired abrading, polishing or honing action upon the work. As specifically illustrating the invention, a specially constructed abrading block may be-arranged upon some nearby portionof the mechanism to engage the work and operable to exert an appropriate abrading action upon the work.

As illustrated in the drawing,a mechanism V Application filed-June 26,

1926. Serial No.'118,625.

is provided for straight in-feed or plunge cut I grinding in which the grinding wheel is of substantially the same width as the surface being ground. With this arrangement, the abrasive polishing blocks are preferably formed as hearing shoes on the steadyrest and are of a width equal to the portion of the 1 work being ground or Ymay be pivotally mounted as a separate member on the steadyrest and arranged to engage thesurface of the work in such a manner that the action of gravity thereupon will press the block into operative engagement with the work.

If it is desirable to apply this invention to a machine arranged for traverse grinding, that is, where either the work or grinding wheel'is reciprocated longitudinally relative to each other, the abrasive member might be mounted in a fixed relatiomwith the grinding wheele Thus, any relative movement between the grinding wheel and workwill produce a similar relative movement between the workand abrasive block.

The invention will be more clearly understood from the following description in conjunction with the accompanying drawing: in which, Y

Fig. 1 is an isometric view of a work steadyrest embodying the invention and arranged 1n engagement with the work;

Fig. 2 is an elevational View partly in sectioal of a portion of the steadyrest, of Fig. 1; an I Fig. 3 is an elevational view the work rest.

. In the drawing, theinvention is'illustrated as embodied in a steadyrest, but it will be understood that the'invention is not so limited and that other embodiments will be apparent to those skilled in the art. This steadyrest comprises a stand 10'provided with suitable slideways 11 and 12 adapted to engage similarly shaped slideways upon a grinding machine of the usual construction, such as is shown in my prior Patents 7 62,550 and 762,838, which of a portion of embody a grinding wheel and means for rotatively supporting work. in contact therewith. A clamp 13 is pivotally mounted on a mounted'uponta shaft 17 mounted in and extending between the sidewalls 1 5 is operatively connected to the clam 13 by a toggle connection, comprising a bi urcated link 18 shaft 19 in the lever16 and at its lower end,

pivotally mounted at its upper end upon a upon a shaft 20 passing through an eye bolt 21 secured in one end of the clamp 13.

A slide 22 is movably mounted within a groove 23 in the stand 10' and is provided at one end with a T-shaped slot 24 adapted to engage the flanged end 25 of a screw 26 threadedin the stand 10 and provided at its outer end with a knurled knob 27 A split nut 28 may be clamped at any point upon the screw 26by a stop screw 29. A stop 33 i mounted in the stand 10 within the path circumscribed by the screw 29 so as tolimit the movement of the screw 26. The other end of the slide 22 is provided with a groove 34 ada ted to receive a'tongue 35 upon a shoe v hol ing member 36 which is securely held upon the slide 22 by means of a screw 37. A

work engaging shoe 38 is held within a groove 39 in the holder 36 by a screw 40.

The slide 22 is provided with a hole so i that it may be moved without interfering with a screw 46 passing through a cover 47 upon the stand10 and en aging a threaded hole'48 in a rib 49 joining t e downwardly and rearwardly extending. side walls 50 of the stand 10. The screw 46 is rovided at its upper end with a knurled knob 51 and passes through a split nut 52 which maybe clamped thereon at any point by a stop screw 53 adapted to engage a stop 54 mounted in the cover 47. I he other end of the screw 46 is adapted to engage a projection 55 on one end of an arm 56 pivotally mounted on'ashaft 57 extending between bosses 58 upon the lower surface of the sidewalls 50. A groove 59 is provided in v the other end of the arm 56 and is adapted to receive-a tongue 60 upon a shoe holding member 61 which is held rigidly upon the arm by a: screw 62 passing through the holdfing member. A work engaging shoe 63 is he d securely within a groove 64 in the holding member 61 b means of a screw 65. The

work engaging s oes 38 and 63 are arranged be brought in contact with .the surface of the wor with suflicient force to produce a lapping or polishing effect upon the work by actuation of the screws. 46 and 29. In this manner the. work pieces are not only round to finished size but are highly 'poli ed or burnished in a single operation in a 'most efiiclent and economlcal manner whereby the labor and trouble of dismounting' the work and remounting it upona spindle in another These shoes serve to smooth the work during grinding and so aid the grinding wheel.

Their action is particularly effective when the wheel cut is dying out, at the end ofthe operation.

If desired, a freelymovable abrading or honing block may be mounted on the steadyrest in such a position as to rest upon the .work Whilethe latter rotates and so polish the work irrespective of the action of the adjustable shoes 38 and 63. To this end, a support 69 having'a pair of parallel upwardly extending ears 70 is mounted-upon the slide 22 and is rigidly secured thereto by bolts 71. "A relatively heavy weight 72, in which an abrading block 73 adapted to engage the work is mounted, is provided with a forwardly extending arm 74 having a shaft 75 therein movably mounted in the elongated slots 7 6 in the ears 70. I

The steadyrest illustrated in the drawing is mounted upon a grinding machine, as is Well understood by those skilled in the art, by

placing the slideways 11 and 12. upon similar 7 slideways upon ethe grinding. machine and then tightening the clamp 13 by pressing the lever 16' downward to actuate the toggle connection. The shoes 38 and 63 are then brought into contact with the surface of the work 66 by turning the knurled knobs 27 and 51 upon the ends of the screws 26 and 46 respectively,

these knobs being turned at desired intervals to maintain the shoes 38 and 63 in contact with eratively connected, within the slots 76, t e

slots 76 being elongated sothat the block 73 may be moved appropriately for difl'erent diameters of work being ground. Thereafter the block 73 will bemoved forward with the 7 shoe 38 as the work is reduced in,size.-

The block 73 may be brought into contact with the work either at the beginning of the grinding operation or during the grinding operation when the work has been brought to near its finished size. The weight 72 is such that the action of gravity thereupon forces the abrading block 73 against the surface of thework with sufficient force to exert a polishin action upon the work. Preferably, the abra ing block 7 3 is constructed of a very fine size;

of abrasive grains united by a vitrified ceramic bond.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. steadyrest for a grindingmachine comprising a stand, a movabl mounted work steadying member thereon aving an abrad ing surface adapted to engage the work, andmeans operable to maintain th contact between said-surface and the"work.

. steadying member mounted thereon, an abra- 7 ing shoe detachably mounted on said stand.

wearer 2 Asteadyrest comprising a stand, a work sive shoe on said member, a relatively stationary abrading member mounted on-the stand and arranged to contact with the rotatable workand means to move the steadyingand abrading members to proper position relative to the work.

3. A steadyrest'comprising a stand, a work.

steadying member movably mounted thereon,

an abrasive shoe on said member, an abrading.

member on the stand movable into contact with the work and means to move the steadying member as the work is reduced insize which maintains the ,abrading member in proper contact with the work.

4. A steadyrest' for a grinding machine comprising a stand, a movable mounted work steadying member, an abrasive shoe on said member, a relatively heavy abrading member pivotally mounted to engage the work under the influence of gravity, and means for moving said steadying member into contactwith the work.

5. A steadyrest for grinding machines comprising a stand, a work, steadying member, means for adjusting said member toward and from the work and an abrasive work polish- 6. A steadyrest for grinding machines comprising a stand, shoe supporting members thereon, means for simultaneously. adjusting said members toward and from the work and an abrasive work steadying shoe detachably mounted on each of said members.

7. A steadyrest for grinding machinescomprising. a stand, a movable shoe support thereon, a work steadying shoe on the support which has an abrading surface arranged I to steady and abrade the work, and means for finely adjusting said shoe support to position the shoe.

* r 8. A steadyrest-for grinding machines comprising a stand, a work steadying member,

from the work, and afreely movable abrasive work polishing shoe mounted on said member r to contact with and abrade the work as the latter rotates.

Signed at Plainville, Connecticut, this 24th day of June, 1926.

CHARLES H. NORTON.

.means for adjusting said member toward and I 

